by westfw » Sat May 14, 2011 11:57 am
Are you more concerned with meeting the requirements of the people you shared FROM, or setting the requirements for the people who might share from you? For the former, you only have to meet the expectations of the source and be polite, while the latter might have legal implications too subtle to have impacted the community yet (although generally copyright law seems to have been made to hinge on intent rather than specific mechanical conformance.)
From my vague legal understanding, CC is essentially a license clarifying the expectations of people holding copyright rights, so it should appear anywhere you have or quote a copyright. The chain of attributions on a large software project can get pretty impressive; I don't see any reason that this won't happen for OSHW as well.